Internal reverse taper expanding bit reamer



19, 1953 e. L. WHITE 2,638,948

INTERNAL REVERSE TAPER EXPANDING BIT REAMER Filed Dec. 22, 1949 ll/lulq'iilj' 'll'ffi ll/llbllllllll,

5" 4 2 Jr/ig Patented May 19, 1953 INTERNAL REVERSE TAPER EXPANDING BIT REAMER I George Lee'White, San Pablo, Calif. Application December 22, 1949, Serial No. 134,376

1 Claim. 1

This invention relates to improvements in devices for reaming out the bottom portion ortwothirds of a hole that is preformed by a straight bit in a wooden railroad tie, and has particular reference to a bit that will function to ream out the hole to provide a gradual taper with the largest diameter of the hole at its bottom.

The principal object of the invention is to provide a portable tool adapted for use on railroad ties for drilling holes therein and to provide in the expansion tool lateral cutting surfaces that will effectively ream the side walls of the preformed hole to the desired degree of taper, and to associate with the bit various sizes of lugs that ,will become imbedded in the bottom of the hole to thus retain the lugs stationary while the bit is turned relative to the lug or lugs.

-An additional object Of the invention is the provision of an internally threaded sleeve that is adapted to fit over and threadedly engage the upper portion of the bit to reinforce the structure of the same and to prevent the divided sections of the lower portion of the bit from further splitting and from being twisted out of alignment.

A further object of the invention is the provision of a device of the character described that consists of comparatively few parts that can be easily and quickly assembled, and a device that is economical to manufacture, strong, durable, and highly efiicient and serviceable in use.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

Fig. 1 is a front elevational view of the bit or reamer constructed in accordance with my invention,

Fig. 2 is a front elevational view disclosing the sleeve of the invention positioned on the shank of the body of the bit,

Fig. 3 is a perspective view of a lug which is associated with the bit,

Fig. 4 is a perspective view of the sleeve, and

Fig. 5 is a fragmentary section of a wooden railroad tie showing the lug of the invention resting in a hole in the tie.

I have recently devised a fastening device that serves to secure rails to railroad ties, which device is intended to replace the conventional spikes used as the securing means for said purpose. In the utilization of my improved fastening device, holes are pre-formed in the tie to accommodate the said fastening element. Accordingly, the

present'invention functions to form or ream the holes in the tie, which holes receive therein the said rail fastening device.

In the" accompanying drawings, wherein for the purpose of illustration is shown the preferred embodiment of my invention, the numeral 6 designates, as a whole, the shankof the reameror bit. The said shank embodies in its construction a solid upper end 1 equipped with a hexagonal head 8 that provides a connection or coupling with a power bit or like medium for rotating the portable bit when it is positioned in a hole 9 of a railroad tie 10 for the purpose of forming therein a hole of gradual taper.

The lower portion of the shank is tubular or 'of' a hollow configuration throughout its length and is slit as at II to furnish the desired degree of flexibility. External threads l2 are provided on a portion of the solid end 1 and on a section of the tubular lower portion. The slot ll serves to divide the tubular portion into two sections l3 and M of similar configuration, that have provided on their outer peripheries external teeth or cutting surfaces 15.

It will be noted that the threads l2 extend downwardly from a point on the upper solid portion of the shank and terminate at the location where the cutting area begins in the tubular portion of the shank.

As disclosed to advantage in Fig. 4, the numeral It indicates a thin metallic sleeve that is equipped with internal thread IT. This sleeve in practice is placed over the upper end of thebit and is moved downwardly to thus threadedly engage the external threads I I. The said sleeves serve to give added strength to the bit structure and function to prevent the sections l3 and M from splitting or being twisted out of alignment. Furthermore, by the manual manipulation of the sleeve, that is by turning it upwardly a few revolutions while the bit is in use, and by turning it downwardly when the work with the bit has been finished, I prevent a springing of the divided sections or a slight bending of the same that might occur from continued use. In other words, the divided sections may have a tendency to remain slightly expanded after usage. In the employment of this particular threaded sleeve this tendency of expansion will be overcome and the divided sections can be drawn tightly together in order that the bit may be easily inserted into the top and tapered portion of the hole that is to be reamed at its bottom.

In Fig. 3 I have illustrated an inverted coneshaped lug l8 that is equipped at its apex with an eye l9, and which is provided with spaced bottom sharpened projections 20. The apex of the cone is snugly receivable in the tubular portion of the bit 6.

It will be obvious that as the bit is turned and is simultaneously being pushed downwardly in the le .9 9f 31 ,1? t e 1 i file-$1 9 0 the sections [3 and I will be reali d. $ets of two or more sizes of lugs are utilized in the reaming operation. The smaller sizes are first used and are then replaced by next larger sizes. By this practice the expansion of sections If. and [4 will be effected. Accordingly, the bit will never be required to cut more than 5;; WW degree of shaving from the walls of the hole'at one operation. Nor will the bit be. subjected to heavy strain or will it be likely to stick in the walls of the hole and become twisted, broken, or 593m Th? h P9 e91 29 9f h?. 1 3 1 ed ptet t 19 h 'e he eed et th t e t a the te t e: e hel thi e ie .e the P ejections prevents the lug from becoming firmly we g d nt he tuttl the e the hit h th urnin h the t The .eeisl he ll al be d s iehe y whi e the h t tetee er uht h he h e e 5 i the @PQX 9 $1. l fihttpt 11, erves as a ttm 9 'reee v h 3+ h h W1? 6 329 which wire serves as a means t9 raise a lug em the le when t s de i ed o replete the 1 by h maller 9 lar e dime s ons h' yp Qt s r t ey h se ted t the t p end of the t l! -Q it gt the lu item the e hh e e the ubu ar he tieh the b t.

. t i to be hhqert eed thet the orm of my invention herewith shown and described is to be taken as a preferred example of the same and that various changes relative to the shape, size, material and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the sub-jointed claim.

Having thus vdescribed my invention, I claim:

A (18171516 of the character described comprising a shank equipped with a solid upper end portion and a slotted lower end portion, said shank being threaded at the juncture of said portions W-iifillth threads extending over a part of each of said portions; the slot in the lower end defining a of sections which are provided with a series of external circumferentially spaced vertically extending rows of teeth capable of reamout, upon a rotation of said device, a hole in a wooden tie to form a tapered hole, and an interha ly th eaded slee threadeel y enga in the e te n l reads to p event a di tortieh f th ections of a d s att l wer end a d a cone shaped pi tie eha l moun d n said o r en and hav n a plura t of b tom te th vfor ahas ne t e tie. ORGE References Cited in the file of this patent N ED S TE ENTS Number Name Date 299,991 Lytle June 10, 1884 915,184 Keirn Mar. 16, 1909 1,690,018 Kerfoot Oct. 3G, 1928 2,074,605 Eggemann Mar. 23, 193! 

